Porsche 911 GT3 Cup 4 Liter

Porsche 911 GT3 Cup – 2011 Grand-Am Rolex Series

The latest version of sports car racing’s most dominant competitor. Taken to its highest level.

The Grand-Am version of the GT3 Cup is modified to maximize its performance on the North American tracks that make-up the Rolex series.

Unique aerodynamic changes enable the car to excel on everything from the tight road course at Lime Rock to the high banking of Daytona. With all competitors running the same spec tire manufactured by Pirelli, suspension settings are a key element to success in the series.

Specifications:

Engine:

- water cooled flat six-cylinder boxer engine

- 3,598 cc; stroke 76.4 mm; bore 99.98 mm diameter - max. torque: 420 Nm

- four valves per cylinder

- dry-sump lubrication

- two-stage resonance intake manifold, central inlet air duct,p> - electronic engine management system MS 3.1

- sequential multi-point fuel injection

- required fuel quality: 98 octane ROZ, unleaded

- race exhaust system in accordance with the GrandAm Series Regulations

Transmission:

- six-speed sequential dog-type gearbox

- gear ratios: ring & pinion gear 8/32 i = 4.00 1st gear 12/38 i = 3.16 2nd gear 15/32 i = 2.13

3rd gear 18/31 i = 1.72 4th gear 20/28 i = 1.40 5th gear 23/26 i = 1.13 6th gear 29/27 i = 0.93

- pressure-oil lubrication

- oil-water heat exchanger - hydraulic clutch centre-release mechanism

- 5 1/2 in triple-disc sintered-metal clutch

- limited slip differential 40/60 % Bodywork: - self-supporting body shell made out of galvanized sheet steel - carbon fiber rear lid - wing supports for the GrandAm standard rear wing - welded-in roll cage incl. shoulder- and door bar - air jack system with controllable discharge - aerodynamically optimized front bumper and front spoiler edge - carbon fiber front and rear bumpers - carbon fiber fenders - racing seat (driver side only) with fire retardant upholstery - six-point seat belt (optimized for HANS) - removable steering wheel (with quick-release coupling) - electric fire extinguishing system - wiper system similar to 911 GT3 RSR (997) - preparation for additional oil tank - 100 liter FT3 fuel tank Suspension: Front axle: - McPherson strut-type axle - all struts supported by Unibal - adjustable trailing arms - Sachs gas pressure shock absorbers - double coil springs (main spring and helper spring) - two-piece lower control arms for camber adjustment - blade-type anti-roll bar - damper mounted to upright with twin-clamp system - power steering with electro-hydraulic pressure feed Rear axle: - multilink rear suspension with solidly mounted sub frame - all struts supported by Unibal - adjustable trailing arms - Sachs gas pressure shock absorbers - double coil springs (main spring and helper spring) - two-piece lower control arms for camber adjustment - reinforced, continuously variable rear axle track rod - blade-type anti-roll bar - suspension continuously variable (height, camber, track) Brake System: - Brake system with adjustable bias bar Front axle: - aluminum six-piston calipers in accordance with the 2008 GrandAm Rolex Series Regulations - internally vented brake discs, 380 mm diameter, race brake pads Rear axle: - aluminum four-piston calipers in accordance with the 2007 GrandAm Rolex Series Regulations - internally vented brake discs, 355 mm diameter, race brake pad Rims/Tires: Front axle: - three-piece BBS aluminum rims (10J x 18) Rear axle: - three-piece BBS aluminum rims (12J x 18)